For this assignment I chose an application to share called Rasterbator. Rasterbator lets you grab any image you have and blow it up to any size you would like. Best of all it does this in a way which lets you print it out at home and put it together like a huge collage that you can then post up anywhere. It's a fun cheap alternative to going to your print shop and paying a small fortune for having them do it. I've done a couple of images and its a lot of fun, you have to let your imagination go and you'll find you come up with a lot of creative ideas. I blew up the head of my wife and her friend and brought it to their graduation. They loved it! The downloadable program works really well so you can take your time and do something that looks really good.
http://www.screencast.com/t/NTk5OWY3Yj